<template>
<div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!--卡片视图区域-->
    <el-card>
        <!--卡片视图区域-->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
        </el-alert>

        <!--步骤条区域-->
        <el-steps :space="200" :active="+activeIndex" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>

        <!--tab标签页-->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave='beforeChangeLeave' @tab-click='tabClicked'>
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price" type="number">
                        <el-input v-model="addForm.goods_price"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight" type="number">
                        <el-input v-model="addForm.goods_weight"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number" type="number">
                        <el-input v-model="addForm.goods_number"></el-input>
                    </el-form-item>
                    <!--级联选择框-->
                    <el-form-item label="商品分类" prop="">
                        <el-cascader v-model="addForm.goods_cat" :options="cataList" :props="{
                                expandTrigger: 'hover',
                                value: 'cat_id',
                                label: 'cat_name',
                                children: 'children',
                                }" @change="handleChange" clearable></el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!--渲染表单的iten项-->
                    <el-form-item :label="item.attr_name" v-for='item in manyTableData' :key='item.attr_id'>
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb" v-for='(cb,i) in item.attr_vals' :key='i' border></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for='item in onlyTableData' :key='item.attr_id'>
                        <el-input v-model='item.attr_vals'></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!--action表示图片要上传的后台api地址-->
                    <el-upload :action="uploadUrl" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers='headerObj' :on-success='handleSuccess'>
                        <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!--富文本编辑器组件-->
                    <quill-editor v-model='addForm.goods_introduce' />
                    <!--添加按钮-->
                    <el-button type="primary" size="small" class="btnGoods" @click='addGoods'>添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
        </el-form>

        <!--图片预览窗口-->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" class="pic">
        </el-dialog>
    </el-card>
</div>
</template>

<script>
import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex: '0',
            // 保存获取表单的数据
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                goods_cat: [],
                // 保存图片临时路径
                pics: [],
                // 商品介绍描述
                goods_introduce: '',
                attrs: []
            },
            // 表单的验证规则
            addFormRules: {
                goods_name: [{
                    required: true,
                    message: '请输入商品名称',
                    trigger: 'blur'
                }],
                goods_price: [{
                    required: true,
                    message: '请输入商品价格',
                    trigger: 'blur'
                }],
                goods_weight: [{
                    required: true,
                    message: '请输入商品重量',
                    trigger: 'blur'
                }],
                goods_number: [{
                    required: true,
                    message: '请输入商品数量',
                    trigger: 'blur'
                }],
                goods_cat: [{
                    required: true,
                    message: '请选择商品分类',
                    trigger: 'blur'
                }]
            },
            // 商品分类数据
            cataList: [],
            // 动态参数数据数组
            manyTableData: [],
            // 静态属性数据数组
            onlyTableData: [],
            // 上传图片的url地址
            uploadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取商品列表数据
        async getCateList() {
            const {
                data: res
            } = await this.$http.get('categories')

            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败！')
            }

            this.cataList = res.data
            // console.log(this.cataList)
        },
        // 级联选择器选中项发生变化，就会触发这个函数
        handleChange() {
            // console.log(this.addForm.goods_cat)
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
            }
        },
        beforeChangeLeave(activeName, oldActiveName) {
            // console.log(activeName)
            // console.log(oldActiveName)
            if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请选择商品分类！')
                return false
            }
        },
        // tab页签被选中时触发
        async tabClicked() {
            if (this.activeIndex === '1') {
                const {
                    data: res
                } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: {
                        sel: 'many'
                    }
                })
                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败！')
                }
                console.log(res.data)
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.lengtn === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            } else if (this.activeIndex === '2') {
                const {
                    data: res
                } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: {
                        sel: 'only'
                    }
                })
                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败！')
                }
                console.log(res.data)
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览的函数
        handlePreview(file) {
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file) {
            // 获取要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(i => i.pic === filePath)
            // 调用数组的splice方法，把图片信息对象，从pics数组中移除
            this.addForm.pics.splice(i, 1)
            console.log(this.addForm)
        },
        // 文件上传成功触发的函数
        handleSuccess(response) {
            // console.log(response)
            // 拼接得到一个图片信息对象
            const picInfo = {
                pic: response.data.tmp_path
            }
            // 将图片信息对象push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        // 添加商品按钮的点击事件
        addGoods() {
            // console.log(this.addForm)
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写需要的项目！')
                }
                // 执行后续添加的业务逻辑
                // 对addform进行深拷贝
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })

                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form)

                // 发起请求，添加商品
                // 商品的名称必须是唯一的
                const {
                    data: res
                } = await this.$http.post('goods', form)

                if (res.meta.status !== 201) {
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功!')
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }

}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important;
}

.pic {
    width: 100%;
}

.btnGoods {
    margin-top: 15px;
}
</style>
